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    <lastBuildDate>Wed, 07 Oct 2026 15:14:42 +0000</lastBuildDate>
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      <title>CVE-2023-50714 — The Oauth2 PKCE implementation is vulnerable</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2023-50714</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; yiisoft yii2-authclient&lt;/p&gt;
&lt;p&gt;yii2-authclient is an extension that adds OpenID, OAuth, OAuth2 and OpenId Connect consumers for the Yii framework 2.0. In yii2-authclient prior to version 2.2.15, the Oauth2 PKCE implementation is vulnerable in 2 ways. First, the `authCodeVerifier` should be removed after usage (similar to `authState`). Second, there is a risk for a `downgrade attack` if PKCE is being relied on for CSRF protection. Version 2.2.15 contains a patch for the issue. No known workarounds are available.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; yiisoft yii2-authclient&lt;/p&gt;
&lt;p&gt;yii2-authclient is an extension that adds OpenID, OAuth, OAuth2 and OpenId Connect consumers for the Yii framework 2.0. In yii2-authclient prior to version 2.2.15, the Oauth2 PKCE implementation is vulnerable in 2 ways. First, the `authCodeVerifier` should be removed after usage (similar to `authState`). Second, there is a risk for a `downgrade attack` if PKCE is being relied on for CSRF protection. Version 2.2.15 contains a patch for the issue. No known workarounds are available.&lt;/p&gt;</content:encoded>
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